I think it would add an interesting element to this game if they would add support jobs to tank/heal/dps.. so to spell it out.. we need tank/heal/dps/SUPPORT
Archer should split into BARD and Ranger... Bard as we know it today should be renamed to Ranger and remain as DPS while Bard becomes a true support job like it always has been before this game. All songs except possibly the speed song will be moved over to BARD and then replaced with something else.
Then we can add in more support jobs like RDM (always been a support job in my mind supporting whm and occasionally some enfeebs..).
Just like many people like to be healers I'm sure there are people who love to be in support roles.
Now I know some people are going to say they want to be DPS RDM.. but that doesn't even make any sense.. its a support role plain and simple.
But lets not get off topic.. Support roles added!? YES PLEASE!
--------------edit---------------
as far as the current party set up goes.. they could beef up the 4 man fights to be alittle harder and make them into 5 man fights.. 8 man fights.. they could allow you to make one of the 4 DPS roles available to be a support role instead.. so 3/1/2/2.